Benjamin holbkook



(No Model.)

B. HOLB'ROOK.

VENTILATOR.

Patented Nov. 6, 1888.

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BENJAMIN HOLBROOK, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE HOLBROOK. di MANN SANITARY EXHAUST VENTILATING COMPANY.

VENTILAT'OR.

SPECIFICATIN .forming part of Letters Patent No. 392,559, dated November 6, 1888.

Application led August 1E), 18S?. Serial No. 247,334. (No model.)

To all whom, it may concern,.-

Be it known that I, BENJAMIN I-loLnnooK, of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Ventilators, oi which the following is afull, clear, and exact description, reference being had to the accompanying drawings, in which- Figure l is a front elevation. Fig. 2 is a vertical section, and Fig. 3 is avertieal section at right angles to that shown in Fig.' 2.

This invention relates to that class of ventilators in which the consumption of oxygen by combustion is relied on to create a draft of air and the ascending heated currents are relied on to carry oft' the unconsumed air and gas. As heretofore constructed, a gas-jet or other -ilame has been arranged in an open tube or iiue, through the lower end of which the air rises freely to and around the flame, and through the upper end of which the heated and expanded remnant of unconsumed air and gas passes away and is discharged. The action of the apparatus as thus constituted is value for the purposes of ventilation.

The object of myinvention is to increase the energy and efficiency of this class of ventilators, so as to render them capable of exhausting large quantities of air in a comparatively short time.

In this class of ventilators, for purposes of convenience of description, the current which rises to the flame from the apartment to be ventilated may be termed the supply-current7 and the current of unconsumed air and gas that rises from the flame may be termed the discharge-current.7

The principle of my invention consists in introducing into the apparatus a mode of operation similar to that of the common blowpipe-that is to say, in reducing the supplypassage into a contracted orifice or orifices and delivering the supply -current through said orifice or orifices directly into or against the flame,which causes immediately great energy of combustion, the liberation of considerable heat, and the establishment of an active current through the supply-passage from the compartment to be ventilated. One of the best forms in which I have applied this principle and demonstrated its great value in increasing the energy and efficiency of' the ventilation is represented in the drawings, in which-e A indicates an ordinary burner of any suitable description; B, the passage by which the discharge current escapes; C, the passage through which the supply current ascends from the room to be ventilated, and d the orioo fice through which the air blows from the supplypassage directly into and against the gasflame.

In the form which I have here shown the supply-passage extendsin the form of asiphon from a point below the level of the burner up above the gas-flame, and then down alongside of or around the discharge-passage to a point opposite to the burner, so that the supply-cnrrent when once started in motion is siphoned, 7o as it were, to the burner, and is heated more or less while on its way. This heating of the supply-current is an improvement, but is not indispensable, the main principle of rnyinvention being entirely independent of such preliminary heating.

Except by way of improvement, the form of the supply-passage is immaterial to the operation of my new principle of ventilation, and even the passage itself may be omitted and 8o the jets of' air introduced directly from the apartment to be ventilated by means of the small jet holes or slit d, arranged to enable the air to blow immediately and directly into and against the flame within the flue, the lower end of which is closed.

In my improvement it will be observed that thc dischargepassage is always separated from the supply-passage .or source of air by means of a partition or wall, in passing which the 9o air is divided or reducedinto a jet orjets, and thus projected in a stream or streams directly into or against the flame.

The burner is situated in a tube or chamber closed at its lower end, provided with a sufeiently wide flue above for the escape of waste products and residue of combustion, and with a lateral j etor orifice, through which the supply air is concentrated into a small or thin stream or streams and forced directly against roo the ilame of the burner, the whole being arranged so that the burning tends to produce a partial vacuum in the lower end of the tube or chamber, while the heated column, escaping through the flue, prevents the air from entering downward through said iiue to supply the flame with oxygen, and thus a strong draft is induced through the lateral jets or orifices, which impinges with great force directly against the iiame and produces the effect of a blow pipe thereon. The deflection of the flame laterally by the blow-pipe action causes it to heat the wall of the tube or chamber, and thus may incidentally increase the upward draft through the escape-flue and the inward rush of air through the lateral jets or orifices.

I claim as my inventionl. The combination of a ventilatingdlue l provided with a contracted inlet-oriiiee and a burner arranged therein so that the oriliee delivers the supply-current in a stream directly into and against the ila-me, substantially as described.

2. The combination of a Ventilating-liuc provided with a contracted inlet-orifice, a burner arranged therein, as described, and a supply flue or passage arranged so as to confine the supply-currents around or in contact with the wall of the discharge-flue, whereby the supply-current of air will be heated previous to its delivery into the flame, substantially as described.

3. rlhe combination of a tube or chamber closed at its lower end and terminating in an escape -ue at its upper end, and a burner Within it, said tube being provided with a contracted inlet-oriiee,whieh directs the incoming airinto and against the ame ofthe burner, creating a blow-pipelike action, substantially as described.

BENJAMIN HOLBROOK.

NVitnesses:

E. L. THURsToN, HENRY N. MANN. 

